NUNKI (Sigma Sagatarii). With an unusual name of Babylonian origin (a proper name of unknown significance), at mid-second magnitude (2.02) Nunki is barely the second brightest star in Sagittarius, the Archer, ...
Nunki is a hot, blue B2.5V main sequence star having a luminosity of about 600 times that of the sun.
The spectral type implies an effective temperature of 22,000 K, a diameter about 5.6 times that of the sun, and a mass of 14 solar masses.
Last, but not least, is Sigma Sagittarii, called Nunki. This name was applied relatively recently by navigators, but it was borrowed from a list of Babylonian star names.
The outer top of the teapot's handle. Because it is close to the ecliptic, Nunki can be occulted by the Moon and very rarely by planets. The last occultation of Nunki by a planet took place on November 17, 1981, when it was occulted by Venus.
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The star is also known as Nunki, a name Babylonians used for the stars they believed represented Eridu, their sacred city. Sigma Sagittarii spins 100 times faster than the Sun, is 630 times more luminous and about seven times as massive.
It can be found west of Xi Sagittari, north of Phi and Sigma Sagittari (Nunki), and east of open cluster M 25, and northeast of Globular Cluster M 22 and Kaus Borealis (Lambda Sagittari).
The main named stars in the field shown are: (Greek alphabet)
Shaula (λ Sco), Girtab (Sargas, θ Sco), Kaus Australis (ε Sgr), Peacock (α Pav), Nunki (σ Sgr) Lesath (υ Sco) Ascella (ζ Sgr) Media ...
KAUS AUSTRALIS (Epsilon Sgr)
Ascella (Zeta Sgr)
Kaus Borealis (Lambda Sgr)
Ain al Rami (Nu 1 Sgr)
Albaldah (Pi Sgr)
NUNKI (Sigma Sgr)
Terebellum (Omega Sgr)
Terebellum (59 Sgr)
Terebellum (60 Sgr)
Terebellum (62 Sgr) ...
Named stars: Alpha Sgr (Rukbat), Gamma Sgr (Alnasi), Delta Sgr (Kaus), Epsilon Sgr (Kaus), Lambda Sgr (Kaus), Omicron Sgr (Nunki) ...
 See also: Star, Sun, Constellation, Sagittarius, Sagitta
  
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